In this lesson, the teacher is teaching students how to say goodbye in different situations. The basics of goodbye are covered, such as saying "bye" and "goodbye." The teacher also teaches students how to shake hands and hug when leaving someone. Additionally, they cover various ways to say goodnight, including "see you later," "good evening," and "good night." The lesson also covers some informal ways to say goodbye, such as "ciao" and "ta-da," which can be used with friends. Finally, the teacher revises all the words learned in the lesson.